systemd: send STOPPING=1 on shutdown

Author: pajod

gunicorn/arbiter.py

@@ -348,6 +348,8 @@ def wakeup(self):
 
     def halt(self, reason=None, exit_status=0):
         """ halt arbiter """
+        systemd.sd_notify("STOPPING=1\nSTATUS=Gunicorn shutting down..\n", self.log)
+
         self.stop()
 
         log_func = self.log.info if exit_status == 0 else self.log.error